Leonard Nimoy, beloved actor from ‘Star Trek’ revealed that he is battling chronic obstructive pulmonary disease (COPD), a serious lung disease. The announcement came after photos of him in a wheelchair and using an oxygen mask hit the web, according to a Feb. 6 report on Huffington Post.

The 82 year old actor made several tweets on Tuesday, talking about his condition and urging fans to give up smoking as soon as possible.

COPD is a term used to identify a group of lung diseases that get progressively worse and are characterized by shortness of breath that worsens with time. Among them are emphysema, chronic bronchitis, refractory (non-reversible) asthma, and some forms of bronchiectasis.

Nimoy first played the role of science office Spock on “Star Trek” in 1966. Following the series, he went on to reprise the role in a number of “Star Trek” movies, the most recent of which was a cameo in 2013’s "Star Trek into Darkness." He also did guest appearances in the science fiction series “Fringe” which ended in 2013.

Though Nimoy stopped attending “Star Trek” conventions in 2011, he is still keeping work commitments and keeps up with "anything involving the Trek world."

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